feat(cursor): Integrate Cursor IDE support with OAuth import token flow

- Add CursorExecutor for handling requests to the Cursor API using protobuf over HTTP/2.
- Implement CursorAuthModal for user token import from local SQLite database.
- Update provider models and constants to include Cursor as a supported provider.
- Enhance API service with token validation and user info extraction from Cursor tokens.
- Introduce utility functions for checksum generation and protobuf encoding/decoding for Cursor API interactions.

open-sse/executors/index.js

@@ -3,6 +3,7 @@ import { GeminiCLIExecutor } from "./gemini-cli.js";
 import { GithubExecutor } from "./github.js";
 import { KiroExecutor } from "./kiro.js";
 import { CodexExecutor } from "./codex.js";
+import { CursorExecutor } from "./cursor.js";
 import { DefaultExecutor } from "./default.js";
 
 const executors = {
@@ -10,7 +11,9 @@ const executors = {
   "gemini-cli": new GeminiCLIExecutor(),
   github: new GithubExecutor(),
   kiro: new KiroExecutor(),
-  codex: new CodexExecutor()
+  codex: new CodexExecutor(),
+  cursor: new CursorExecutor(),
+  cu: new CursorExecutor() // Alias for cursor
 };
 
 const defaultCache = new Map();
@@ -31,4 +34,5 @@ export { GeminiCLIExecutor } from "./gemini-cli.js";
 export { GithubExecutor } from "./github.js";
 export { KiroExecutor } from "./kiro.js";
 export { CodexExecutor } from "./codex.js";
+export { CursorExecutor } from "./cursor.js";
 export { DefaultExecutor } from "./default.js";